Electric translating device



Marh 26, 1929. w, BRUCE, JR 1,706,480

ELECTRIC TRANSLATING DEVICE Filed July 1924 Patented Mar. 26, 1929.

UNETED STATES WILLIAM M. BRUCE, JR.,

F SPRINGFIELD, OHIO.

nnncrmo TRANSLATING nnvicn.

Application filed July 3, 1924. Serial No. 723,995.

My invention relates to improvements in electric translating devices, particularly in the nature of thermionic repeaters, the particular features herein shown and described being in the nature of improvements in the method and devices set forth in my pending application 630,294, filed April 6, 1923.

Briefly stated I employ a receiving device preferably of the galvanometer or movable 1o coil type which is adapted to receive signals or other current impulses from any source of supply such as a submarine cable or an aerial of a radio circuit and by the movements of this receiving device I open and close the grid circuit of a thermionic tube having a source of current potential, there being located in the plate circuit of said tube a relay or other translating or repeating device which is operated by local battery passing through the plate circuit by the changes of potential on the grid circuit caused by the opening and closing of the grid circuit by the receiving device.

In the accompanying drawings:

Fig. 1 is a diagrammatic view showing circuits and apparatus as arranged for receiving signals on submarine cables, this view showing two thermionic tubes and repeating devices for repeating positive and negative impulses which would constitute the signals from the submarine cable.

Fig. 2 is a modification in which a single tube is shown operating through a transformer,

In the said drawings a represents a receiver whose vibrating coil a is provided with a tongue ta This tongue is adapted to move by the current impulses in the coil a between cbntacts a and ar These coneo tacts a and a are in circuits which include the grids g and g of thermionic tubes t and Z these circuits being completed through the filament of the respective tubes and battery I) to the tongue a This battery is so connected so that as the circuit is closed through the grid of either tube, negative potential is placed upon thegrid of that tube: Relays 1' and r are in circuits from the respective plates p and p from battery 6 through filament 7 and f so that these relays or other form of repeating device will receive the current from battery b through the respective plate circuits of the tubes and t which will hold these relays or repeating devices in operated position. As the tongue (1' contacts with either the contacts a or a negative potential will be put upon the grid of one or the other of the tubes which will stop the flow of the current through the plate circuit of'th-at particular tube and permit the relay or other translating devices to move to a difi'erent position and thus operate the apparatus or devices for repeating the current impulses which come to the grid of the tubes through the operation of the receiver a. y

In Fig. 2 I have the same arrangement except that only one tube is here used and a transformer e is substituted for the relay 1'. I have also shown the tongue a adapted to contact on either side with a contact a or a1 which would close the grid circuit of the tube 6 and put negative potential on the grid and thus stop the flow of current from battery 6 in the plate circuits to the transformer e so long as the grid circuit is closed by the tongue m at either contact a. The opening and closingot the grid circuit at the contacts a would cause the signal or other impulses to be repeated through the transformer e.

Having thus described my invention, I claim:

1. In a thermionic relay, the combination with a vacuum tube having a cathode, anode and grid, of a translating device and source of current supply between said cathode and anode, a grid circuit including a source of electrical energy and a switch serially connected between cathode and grid, the circuit connections to said source of electrical energy being such that upon closure of said switch the grid is brought to a more negative potential than the cathode, and anelectrical instrument of the current controlled type for operating said switch.

2. In a thermionic repeater, a moving coil receiver having a movable contact member, a stationary contact cngageable by said movable contact to close a circuit including the grid element of a thermionic tube and a source ofnegative potential so as to place negative potential on said grid when said circuit is closed, and a closed plate circuit for said tube including a source of current supply and a repeating device as speci- 3. In a thermionic tube repeater, 2, vibrating receiving device adapted to close a normally open grid circuit of a thermionic tube, a battery in said grid circuit with its negative pole connected to said movable concurrent supply in the plate circuit of said tube so that the closingof the grid clrcuit by the vibrating receiving device will put negative potential on the grid of said tube and stop the flow of current through the plate circuit.

4. In a thermionic rep-eater, a movabl contact with stationary contacts on each side thereof, the stationary contacts being connected respectively to the grids of thermionic tubes, a source of current supply whose negative pole is connected to said movable contact with the positivepole connected to the respective filaments of said tubes so that as said contact is moved in one position or another negative potential will be supplied to the respective grids of said tubes, repeating devices With a source of current supply in the respective plate circuits of said tubes so that as the movable contact moves in one position or the other the repeating devices in one or the other plate circuits of the tubes will be operated as set forth.

In testimony whereof, I have hereunto set my hand this 1st day of July, 1924.

WILLIAM M. BRUCE, JR. 

